Shrub InvasiveThis plant is considered invasive Ligustrum obtusifolium [Border Privet] Performs well as an informal hedge, but perhaps too coarse to be a good formal clipped hedge. Extremely tolerant of different soils and climates. Can be coppiced to rejuvenate. Can be invasive by seed.
Shrub InvasiveThis plant is considered invasive Ligustrum obtusifolium var. regelianum [Regelianum Border Privet] Ligustrum obtusifolium var. regelianum adds an interesting textural effect to the landscape with its horizontally arranged branches and distichously arranged (in one, flat plane) leaves. An excellent plant used as an informal hedge, but perhaps too coarse to be a good formal clipped hedge. Extremely tolerant of different soils and climates. Can be coppiced to rejuvenate. Can be invasive by seed.
Shrub InvasiveThis plant is considered invasive Lonicera maackii [Amur Honeysuckle] Widely adaptable to different soils and exposures. Can be trained into a small patio tree. Suckers freely, requiring pruning in intensive situations. Seeds, carried by birds, germinate freely, and weed seedlings result. High shade tolerance contributes greatly to its highly invasive character. Perhaps the worst woody weed in the Midwestern and Northwestern US.
Shrub InvasiveThis plant is considered invasive Lonicera tatarica [Tatarian Honeysuckle] Widely adapted to different soils and exposures, but avoid wet soils. Pruning of dead twigs is required periodically. Renewal pruning to a low framework every 5-8 years is helpful to maintain nice form and vigor. Russian aphid, which causes witches brooming, is a significant pest. Lonicera tatarica readily invades open woodlands, old fields, and other disturbed sites. It can spread rapidly due to birds and mammals dispersing the seeds and can form an extremely dense…
Shrub InvasiveThis plant is considered invasive Lonicera tatarica 'Zabelii' [Zabelii Tatarian Honeysuckle] Widely adapted to different soils and exposures, but avoid wet soils. Pruning of dead twigs is required periodically. Renewal pruning to a low framework every 5-8 years is helpful to maintain nice form and vigor. Russian aphid, which causes witches brooming, is a significant pest. Lonicera tatarica readily invades open woodlands, old fields, and other disturbed sites. It can spread rapidly due to birds and mammals dispersing the seeds and can form an extremely dense…
Tree InvasiveThis plant is considered invasive Morus alba [White Mulberry] It will grow in nearly any situation. There are occasional problems with cankers, mites, and bacterial blights. Morus alba is very similar to the native red mulberry (Morus rubra), but may be distinguished by the leaves. Its leaves have glossy surfaces whereas the leaves of Morus rubra do not. Morus alba is found throughout the United States, where it invades old fields, urban lots, roadsides, forest edges, and other disturbed areas. It poses an ecological…
Tree InvasiveThis plant is considered invasive Phellodendron amurense [Amur Corktree] A striking tree for its interesting bark and massive framework. Widely adaptable to soil, trouble-free, and drought and pollution resistance. Easily transplanted. May be less hardy when young and rapidly growing. Fruits smell like turpentine when crushed (or stepped on). This tree is demonstrating invasive characteristics in suburban and urban fringe forests. It escapes intended plantings to invade and displace native hardwood forests. Note: only female plants have the potential to become invasive. Phellodendron amurense…
Tree InvasiveThis plant is considered invasive Pyrus calleryana [Callery Pear] Overused, weak wooded, short-lived. Flowers are malodorous and often killed by late spring freezes. Some fireblight susceptiblity. Forms narrow crotch angles that can result in a larger tree literally splitting in two. Very small fruits are a litter problem when abundant. Considered invasive in many areas.
Tree InvasiveThis plant is considered invasive Pyrus calleryana 'Aristocrat' [sold as Aristocrat®] [Aristocrat Callery Pear] Aristocrat is one of the better performing Callery Pear variants. Flowers are malodorous, but the later blooming Aristocrat flowers are not as often killed by late spring freezes as are the flowers of other P. calleryana variants. Some fireblight susceptiblity, especially in the south. The branching of Aristocrat is more horizontal and does not form as narrow crotch angles as many other Callery Pears. Very small fruits are a litter problem when abundant. Considered invasive…
Tree InvasiveThis plant is considered invasive Pyrus calleryana 'Bradford' [Bradford Callery Pear] The cultivar 'Bradford' was exceedingly popular in the recent past, becoming overused because of its beautiful white flower show and outstanding scarlet to purple fall color. However, it is now advised not to use this short-lived cultivar, as it has very weak wood and tight branch angles and is quite prone to serious breakage. Forms narrow crotch angles that can result in a larger tree literally splitting in two. Flowers are malodorous and often killed…
